I'd suggest doing a little homework on reliability, customer service, and personally handling both rifles. Good luck, and I hope you have a good experience with an AR15. Whenever my friends / co-workers get a chance to shoot mine, they end up wanting one of some sort.

I'll echo wyosmith. While i'm not completely building my own, I'm building a lower and then buying a completed upper. It'll feel a lot more like my /own/ weapon than just buying one off a shelf.

Edit: That being said I've heard a lot of mixed reviews on SigSauer ARs and mostly negative on Bushmaster.

__________________
I told the new me,
"Meet me at the bus station and hold a sign that reads: 'Today is the first day of the rest of your life.'"
But the old me met me with a sign that read: "Welcome back."
Who you are is not a function of where you are. -Off Minor

They are both good companies. I have shot many Bushmasters and liked them all. They are the number one provider of civilian AR's. on the other hand I really like the Sig. I have shot a buddies quite a bit. It seemed like a very good rifle. So much that I even though about picking one up at WalMart on Black Friday. You would be fine with either one. The key is to find the one that suits you the best.

__________________
" The strongest reason for the people to retain the right to
keep and bear arms is, as a last resort, to protect
themselves against tyranny in Government...." - Thomas Jefferson

I would go with a S&W M&P 15 over either in that price range if possible. (Or Spikes if available)

Or I would save up a little more and get a Colt 6920. ($1,099 at my local Wal-mart)

But, given the choice between the 2 you have listed, I would go with the Sig. Just because I have had so much bad luck with the Bushmasters in the past, even before they got bought out by Cerberus. (when the quality was supposed to be better)

Edit: That being said I've heard a lot of mixed reviews on SigSauer ARs and mostly negative on Bushmaster.

I must be a lucky guy, my Bushmaster M4A2 Carbine eats steel and brass and has never failed me.

I've never built and AR, but have read enough to realize, it can be a costly build, or an unsafe cheap build. Lots of AR stuff out there, do your research and don't believe everything you see on YouTube.

__________________No one reads or cares what is written in ones signature box. So I'm not writing anything worth reading or remembering.

I have no experience with the Sig M400 but with my past personal experience with Bushmaster I would gamble on the Sig before ever going with Bushmaster again. Just out of curiosity why are you limited to those two choices?

__________________
Just face shoot the criminal was the advice I was given. Old tech new tech, face shooting will nearly always take the wrong doing out of a bad guy.

I wouldn't buy either one, there are better choices in the $900-1000 range. If you held my feet to the fire, then the SIG.

I've never bought a complete AR because it's so hard to find one configured exactly like you want. It can be done but odds are you need more than just two companies. I have built four nice ARs at that price point and have been pleased with each one. Quality parts were used for each.

The SIG M400 is my choice... there are too many good things about it. And that's why I have it over the others mentioned in this thread. It is very well finished etc and shoots MOA shockingly easily. Good use of chrome throughout the gun and it is immaculate.

The progressive 5R twist on the M&P comes close second for me. The Bushmasters I handled did not feel right. The SIG really is aimed at Military and Law Enforcement. That speaks volumes.

Edit: That being said I've heard a lot of mixed reviews on SigSauer ARs and mostly negative on Bushmaster.

Sigs are fine and Bushmaster is probably the most popular 'reasonably priced' AR supplier in the US. I've owned a couple of Bushies and shot several more and there was absolutely nothing wrong with them.

But they are ARs and a lot of people with zero clue have bought and continue to buy them. They then get their internet keyboard warrior armor on and say "Bushmaster sux, so happy I now have a Noevske'. Yawn.

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